A string or rope will break apart if it is placed under too much tensile stress. Thicker ropes can withstand more tension without breaking because the thicker the rope, the greater the cross-sectional area and the smaller the stress. One type of steel has density 7740 kg/m^3 and will break if the tensile stress exceeds 7.0 x 10^8N/m^2. You want to make a guitar string from a mass of 4.2 g of this type of steel. In use, the guitar string must be able to withstand a tension of 900 N without breaking.
(a) Determine the maximum length the string can have.
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